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Note E - Other Comprehensive Loss (Tables)
 12 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Year Ended June 30, 2021
  
   
Defined Benefit
Pension Plan
    
Unrealized
(Losses) Gains
on
Cash Flow
Hedges
    
Total
  
                         
Balance as of June 30, 2020
   $
(888
)
   $
(295
)
   $
(1,183
)
                         
OCI/OCL before reclassifications
    
337
      
(2,817
)
    
(2,480
)
Amounts reclassified from OCI
    
123
      
3,173
      
3,296
  
                         
Tax effect of OCI activity
    
(110
)
    
(84
)
    
(194
)
Net current period OCI/OCL
    
350
      
272
      
622
  
Balance as of June 30, 2021
   $
(538
)
   $
(23
)
   $
(561
)
   
Year Ended June 30, 2020
  
   
Defined Benefit
Pension Plan
    
Unrealized
(Losses) Gains
on
Cash Flow
Hedges
    
Total
  
                         
Balance as of June 30, 2019
   $
(491
)
   $
783
     $
292
  
                         
ASU 2018-02 Adjustment
    
(74
)
    
(54
)
    
(128
 )
OCI/OCL before reclassifications
    
(404
)
    
1,400
      
988
  
Amounts reclassified from OCI
    
(20
)
    
(2,747
)
    
(2,759
)
                         
Tax effect of OCI activity
    
101
      
323
      
424
  
Net current period OCI/OCL
    
(397
)
    
(1,078
)
    
(1,475
)
Balance as of June 30, 2020
   $
(888
)
   $
(295
)
   $
(1,183
)